EP2736102A1 - Elektrodenanordnung und wiederaufladbare Batterie damit - Google Patents

Elektrodenanordnung und wiederaufladbare Batterie damit Download PDF

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Publication number
EP2736102A1
EP2736102A1 EP13181665.4A EP13181665A EP2736102A1 EP 2736102 A1 EP2736102 A1 EP 2736102A1 EP 13181665 A EP13181665 A EP 13181665A EP 2736102 A1 EP2736102 A1 EP 2736102A1
Authority
EP
European Patent Office
Prior art keywords
electrode
negative electrode
uncoated region
active material
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13181665.4A
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English (en)
French (fr)
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EP2736102B1 (de
Inventor
Yoon-Tai Kwak
Jeong-Won Oh
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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Publication date
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Publication of EP2736102A1 publication Critical patent/EP2736102A1/de
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Publication of EP2736102B1 publication Critical patent/EP2736102B1/de
Active legal-status Critical Current
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the invention relates to an electrode assembly and a rechargeable battery having the same.
  • Rechargeable batteries are batteries that can be repeatedly charged and discharged, e.g., as opposed to primary batteries that are incapable of being recharged.
  • Small-capacitance rechargeable batteries may be used for small portable electronic devices, e.g., a mobile phone, a laptop computer, and a camcorder, and large-capacitance batteries may be used to supply power, e.g., for driving a driving motor in hybrid vehicles.
  • the high power rechargeable battery is configured as a large-capacitance battery module by connecting a plurality of rechargeable batteries in series and or in parallel to be used for driving a motor in a machine requiring large power, e.g., an electric vehicle.
  • the rechargeable battery may be formed in a cylindrical shape, a polygonal shape, or a pouch shape.
  • the positive electrode comprises a positive electrode current collector and a positive active material layer disposed on both sides of the positive electrode current collector
  • the negative electrode comprises a negative electrode current collector and a negative active material layer disposed on both sides of the negative electrode.
  • the positive electrode and the negative electrode are wound with a separator therebetween to define an electrode assembly.
  • the object of the invention is to provide a rechargeable battery having a high energy density.
  • the electrode assembly comprises a positive electrode comprising a positive electrode current collector and a positive active material layer on each of first and second surfaces of the positive electrode current collector, a negative electrode comprising a negative electrode current collector and a negative active material layer on each of first and second surfaces of the negative electrode current collector, and an inner separator between the positive electrode and the negative electrode, wherein each of the positive electrode and the negative electrode comprises a side end uncoated region at respective side ends of the positive electrode and the negative electrode, the side end uncoated regions of each of the positive and negative electrodes comprising no active material layers on respective electrode current collectors.
  • the object is achieved according to the invention in that at least one of the positive electrode and the negative electrode has an inner uncoated region positioned at a center of the electrode assembly, the inner uncoated region comprising no active material layer thereon.
  • the inner uncoated region is formed where the electrodes face each other, in particular at the innermost side of the electrode assembly, it is possible to reduce the volume and the weight of the electrode assembly by removing unnecessary active material that is not associated with charging and discharging. Therefore, the energy density of the electrode assembly and the rechargeable battery is improved.
  • the inner uncoated region may be folded to face each other, i.e. a portion of the folded inner uncoated region may face another portion of the folded inner uncoated region.
  • An active material layer may be formed on the side of the current collector opposite the inner uncoated region, in contact with the separator.
  • the electrode assembly may be spirally wound with the separator between the positive electrode and the negative electrode, and the inner uncoated region and the side end uncoated region of any one of the positive electrode and the negative electrode may be connected with each other.
  • any one of the positive electrode and the negative electrode may have an outer uncoated region without an active material layer formed, on one side of the current collector, and the outer uncoated region may be positioned at the outermost side of the electrode assembly.
  • An active material layer may be formed on the side of the current collector opposite the outer uncoated region, in contact with the separator, and the outer uncoated region may be connected with the side end uncoated region.
  • the inner uncoated region may be formed at the negative electrode and the inner uncoated region is formed at the positive electrode.
  • a rechargeable battery comprising: an electrode assembly that performs charging and discharging; a case accommodating the electrode assembly; and a terminal electrically connected with the electrode assembly and protruding outside the case, wherein the electrode assembly is preferably the electrode assembly according to the invention and as described above that may comprise: a positive electrode current collector and a positive electrode comprising a positive active material layer disposed on both sides of the positive electrode current collector; a negative electrode current collector and a negative electrode comprising a negative active material layer disposed on both sides of the negative electrode current collector; and an inner separator disposed between the positive electrode and the negative electrode, and the positive electrode and the negative electrode comprise a side end uncoated region formed at side ends of the positive electrode and the negative electrode, without an active material layer formed on both sides of the current collectors, and any one of the positive electrode and the negative electrode has an inner uncoated region positioned at the center of the electrode assembly, without an active material layer formed.
  • the inner uncoated region may be folded to face each other, and an active material layer may be formed on the side of the current collector opposite the inner uncoated region, in contact with the separator.
  • the electrode assembly may be spirally wound with the separator between the positive electrode and the negative electrode, and the inner uncoated region and the side end uncoated region of any one of the positive electrode and the negative electrode may be connected with each other.
  • any one of the positive electrode and the negative electrode may have an outer uncoated region without an active material layer formed, on one side of the current collector, and the outer uncoated region may be positioned at the outermost side of the electrode assembly.
  • An active material layer may be formed on the side of the current collector opposite the outer uncoated region, in contact with the separator, and the outer uncoated region may be connected with the side end uncoated region.
  • the inner uncoated region may be formed at the negative electrode and the inner uncoated region is formed at the positive electrode.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 .
  • a rechargeable battery 101 may comprise an electrode assembly 10 wound with a separator 13 between a positive electrode 11 and a negative electrode 12, a case 28 in which the electrode assembly 10 is disposed, and a cap assembly 30 coupled to the opening of the case 28.
  • the rechargeable battery 101 according to the first exemplary embodiment is exemplified as a rectangular lithium ion rechargeable battery.
  • the example embodiments are not limited thereto and may be applied to various shapes of batteries, e.g., a lithium polymer battery or a cylindrical battery.
  • the case 28 may have a substantially cuboid body, and an opening is formed at one side of the cuboid body.
  • the case 28 may be made of metal, e.g., aluminum and/or stainless steel.
  • the cap assembly 30 may comprise a cap plate 31 covering the opening of the case 28, a positive terminal 21 protruding outward from, e.g., above, the cap plate 31 and electrically connected with the positive electrode 11, and a negative terminal 22 protruding outward from, e.g., above, the cap plate 31 and electrically connected with the negative electrode 12.
  • the cap plate 31 may be a rectangular plate that is longer in one direction than in another direction, and may be coupled to the opening of the case 28.
  • the cap plate 31 may be made of metal, e.g., aluminum.
  • a sealing cap 38 disposed in an electrolyte injection opening 32 and a vent member 39 disposed in a vent hole 34 and having a notch 39a to be opened at a predetermined pressure, are disposed in the cap plate 31.
  • the positive terminal 21 is electrically connected with the positive electrode 11 through a current collecting tap 42
  • the negative terminal 22 is electrically connected with the negative electrode 12 through a current collecting tap 41.
  • a terminal connecting member 25 electrically connecting the positive terminal 21 with the current collecting tap 42 may be disposed between the positive terminal 21 and the current collecting tap 41.
  • the terminal connecting member 25 may be inserted in a hole formed in the positive terminal 21, so an the upper end of the terminal connecting member 25 may be fixed to the positive terminal 21 by welding and a lower end of the terminal connecting member 25 may be fixed to the current collecting tap 42 by welding.
  • a gasket 55 for sealing may be inserted in a hole through which the terminal connecting member 25 passes, between the terminal connecting member 25 and the cap plate 31, and a lower insulating member 43, in which the lower portion of the terminal connecting member 25 is inserted, may be disposed under the cap plate 31.
  • An upper insulating member 52 electrically insulating the positive terminal 21 from the cap plate 31 is disposed under the positive terminal 21.
  • the terminal connecting member 25 may be fitted in the upper insulating member 52.
  • a terminal connecting member 26 electrically connecting the negative terminal 22 with the current collecting tap 41 may be disposed between the negative terminal 22 and the current collecting tap 41.
  • the terminal connecting member 26 may be inserted in a hole formed in the negative terminal 22, with the upper end fixed to the negative terminal 22 by welding and the lower end fixed to the current collecting tap 41 by welding.
  • a gasket 65 for sealing may be inserted in a hole in which the terminal connecting member 26 is inserted, between the negative terminal 22 and the cap plate 31, and a lower insulating member 45, insulating the negative terminal 22 and the current collecting tab 41 from the cap plate 31, may be disposed under the cap plate 31.
  • An upper insulating member 62 electrically insulating the negative terminal 22 from the cap plate 31 may be disposed under the negative terminal 22.
  • the terminal connecting member 26 may be fitted in the upper insulating member 62.
  • FIG. 3 is an exploded perspective view of the electrode assembly 10 according to the first exemplary embodiment.
  • FIG. 4 is a cross-sectional view of the electrode assembly 10 shown in FIG. 3 in a coupled and wound state.
  • the positive electrode 11 is structured by forming a positive active material layer 113 on both sides of a positive electrode current collector 112 formed of a thin plate metal foil.
  • the positive electrode current collector 112 may have a flat shape extending along a first direction, so a positive active material layer 113 may be formed on longitudinal opposite surfaces of the positive electrode current collector 112, as illustrated in FIG. 3
  • the positive electrode current collector 112 may be formed in a stripe shape, e.g., may be longer in one direction than in another direction, and may be made of a metal, e.g., aluminum and/or stainless steel.
  • the positive active layer material 113 may be made of, e.g., LiCoO 2 , LiMnO 2 LiFePO 4 , LiNiO 2 and LiMn 2 O 4 , a conductive agent, and a binder.
  • the positive active material layer 113 may be coated or attached by laminating on the positive electrode current collector 112.
  • the positive electrode 11 comprises a positive electrode coating portion 11a that is a region coated with the positive active material layer 113, and a positive electrode side end uncoated region 11b that is a region without the positive active material layer 113 coated.
  • the positive electrode side end uncoated region 11b is on a portion of each of the longitudinal opposite surfaces of the positive electrode current collector 112, so portions of both sides of the positive electrode current collector 112 are exposed at the positive electrode side end uncoated region 11b.
  • the positive electrode side end uncoated region 11b is formed to continue along one side end of the positive electrode 11 in the longitudinal direction I of the positive electrode 11.
  • the negative electrode 12 is structured by forming a negative active material layer 123 on both sides of the negative electrode current collector 122 formed of a thin plate metal foil.
  • the negative electrode current collector 122 is formed in a stripe shape that is longer in one direction than in another, e.g. perpendicular, direction and made of a metal, e.g., copper and/or stainless steel.
  • the negative active material layer 123 is made of, e.g., Li 4 Ti 5 O 12 or a carbon-based active material, a conductive agent, and a binder.
  • the negative active material layer 123 may be coated or attached by laminating on the negative electrode current collector 122.
  • the separator 13 may be made of a porous material.
  • the separator 13 insulates the positive electrode 11 from the negative electrode 12, and provides a passage through which ions move.
  • the negative electrode 12 comprises a negative electrode coating portion 12a that is a region coated with a negative active material layer 123, and a negative electrode side end uncoated region 12b that is a region without the negative active material layer 123 coated.
  • the negative electrode side end uncoated region 12b is on a portion of each of the longitudinal opposite surfaces of the negative electrode current collector 122, so portions of both sides of the negative electrode current collector 122 are exposed at the negative electrode side end uncoated region 12b.
  • the negative electrode side end uncoated region 12b is formed to continue along one side end of the negative electrode 12 in the longitudinal direction I of the negative electrode 12.
  • the negative electrode 12 further comprises a negative electrode inner uncoated region 12c formed at the front end of the negative electrode 12 and/or a negative electrode outer uncoated region 12d formed at the rear end of the negative electrode 12.
  • the negative electrode inner uncoated region 12c is positioned at the innermost side of the electrode assembly 10 and/or the negative electrode outer uncoated region 12d is positioned at the outermost side of the electrode assembly 10.
  • the negative electrode inner uncoated region 12c continues in the width direction w of the negative electrode 12 from the front end of the negative electrode 12 and is connected with the negative electrode side end uncoated region 12b.
  • the negative electrode inner uncoated region 12c is configured without the negative active material layer 123, so one side of the negative electrode current collector 122 is exposed at the negative electrode inner uncoated region 12c.
  • respective corners of the negative electrode current collector 122 and one negative active material layer 123 may be aligned with each other, so the negative electrode inner uncoated region 12c and the negative electrode side end uncoated region 12b may be arranged along an outer boundary of the negative active material layer 123 in an L-shape.
  • the negative electrode outer uncoated region 12d continues in the width direction w of the negative electrode 12 from the rear end of the negative electrode 12 and is connected with the negative electrode side end uncoated region 12b.
  • the negative electrode outer uncoated region 12d is configured without the negative active material layer 123 formed on one side of the negative electrode current collector 122, and thus one side of the negative electrode current collector 122 is exposed at the negative electrode outer uncoated region 12d.
  • respective corners of the negative electrode current collector 122 and another negative active material layer 123 may be aligned with each other, so the negative electrode outer uncoated region 12c and the negative electrode side end uncoated region 12b may be arranged along an outer boundary of the negative active material layer 123 in an L-shape.
  • the negative electrode inner and outer uncoated regions 12c and 12d may be on opposite surfaces of the negative electrode current collector 122 and on opposite ends of the negative electrode current collector 122.
  • the negative electrode inner and outer uncoated regions 12c and 12d may be horizontally spaced apart from each other, i.e., along a length of the negative electrode current collector 122 in a longitudinal direction I, so the negative electrode inner and outer uncoated regions 12c and 12d may not overlap each other.
  • the positive electrode 11 and the negative electrode 12 are spirally wound after disposing the separator 13, i.e., an insulator, therebetween, and then pressed flat.
  • the negative electrode inner uncoated region 12c is disposed at the center of the electrode assembly 10, e.g., to face the open space in the center of the electrode assembly 10.
  • the negative active material layer 123 is arranged on the opposite side of the negative electrode inner uncoated region 12c, so the negative active material layer 123 comes in contact with the separator 13, i.e., the negative active material layer 123 on a first surface of the negative electrode current collector 122 separates between the separator 13 and the negative electrode inner uncoated region 12c on a second surface of the negative electrode current collector 122. Then, the negative and positive electrodes 11 and 12 with the separators 13 are stacked and are spirally wound together, so the winding direction is such that the negative electrode inner uncoated region 12c is folded to have one portion thereof directly face another portion thereof, as illustrated in FIG. 4 .
  • the negative electrode inner uncoated region 12c is formed on only one inner side of the negative electrode 12 and the negative active material layer 123 is coated on the other side.
  • the negative active material layer 123 formed on the opposite side (inner side) of the negative electrode inner uncoated region 12c faces the positive active material layer 113 with the separator 13 therebetween and is associated with charging and discharging.
  • the negative electrode outer uncoated region 12d is disposed at the outermost side of the electrode assembly 10 and exposed to the outside of the electrode assembly 10.
  • the portion where the negative electrode outer uncoated region 12d is formed i.e., a portion formed to be longer than the positive electrode 11, protrudes further than the positive electrode 11 and surrounds the positive electrode 11.
  • the negative active material layer 123 is formed on the opposite side of the negative electrode outer uncoated region 12d, so the negative active material layer 123 comes in contact with the separator 13.
  • the negative electrode outer uncoated region 12d is formed on only one outer side of the negative electrode 12 and the negative active material layer 123 is coated on the other side.
  • the negative active material layer 123 formed on the opposite side (inner side) of the negative electrode outer uncoated region 12d faces the positive active material layer 113 with the separator 13 therebetween and is associated with charging and discharging.
  • the negative electrode inner uncoated region 12c is formed where the negative electrodes 12 face each other at the innermost side of the electrode assembly 10, it is possible to reduce the volume and the weight of the electrode assembly 10 by removing unnecessary active material layer that is not associated with charging and discharging. Further, since the negative electrode outer uncoated region 12d is formed at a portion that does not face the positive electrode 11 at the outermost side of the electrode assembly 10, it is possible to reduce the volume and the weight of the electrode assembly 10. Therefore, the energy density of the electrode assembly 10 and the rechargeable battery 101 is improved.
  • FIG. 5 is an exploded perspective view showing an electrode assembly according to a second exemplary embodiment.
  • FIG. 6 is a cross-sectional view of the electrode assembly in FIG. 5 in a coupled and wound state.
  • an electrode assembly 200 comprises a positive electrode 210, a negative electrode 220, and a separator 230 disposed between the positive electrode 210 and the negative electrode 220.
  • the positive electrode 210 and the negative electrode 220 are spirally wound with the separator 230 therebetween, and then pressed flat.
  • the rechargeable battery according to the present exemplary embodiment has the same structure as that of the rechargeable battery according to the first exemplary embodiment, except for the structure of the electrode assembly 200, so the description of the same structure is not repeated.
  • the positive electrode 210 is structured by forming a positive active material layer 213 on both sides of a positive electrode current collector 212 formed of a thin plate metal foil.
  • the positive electrode 210 comprises a positive electrode coating portion 210a that is a region coated with an active material and a positive electrode side end uncoated region 210b that is a region without an active material coated.
  • the positive electrode side end uncoated region 210b is formed to continue along one side end of the positive electrode 210 in the longitudinal direction I of the positive electrode 210.
  • a negative active material layer 223 is attached to both sides of a negative electrode current collector 222 formed of a thin plate metal foil, and the negative electrode current collector 222 is formed in a stripe shape that is longer in one direction than in another direction.
  • the negative electrode 220 comprises a negative electrode coating portion 220a that is a region coated with an active material and a negative electrode side end uncoated region 220b that is a region without an active material coated.
  • the negative electrode side end uncoated region 220b is formed to continue along one side end of the negative electrode 220 in the longitudinal direction I of the negative electrode 220, e.g., the negative electrode coating portion 220a and the negative electrode side end uncoated region 220b are positioned parallel to each other.
  • the negative electrode 220 comprises a negative electrode inner uncoated region 220c formed at the front end of the negative electrode 220, and the negative electrode inner uncoated region 220c is positioned at the innermost side of the electrode assembly 200.
  • the negative electrode inner uncoated region 220c continues in the width direction w of the negative electrode 220 from the front end of the negative electrode 220 and is connected with the negative electrode side end uncoated region.
  • the negative electrode inner uncoated region 220c is configured without the negative active material layer 223 formed on one side of the negative electrode current collector 222, so the negative electrode current collector 222 is exposed at the negative electrode inner uncoated region 220c.
  • the negative electrode 220 comprises the negative electrode inner uncoated region 220c, i.e., as the negative electrode inner uncoated region 120c of the first exemplary embodiment, the negative electrode 220 does not comprise a portion equivalent to the negative electrode outer uncoated region 120d of the first exemplary embodiment.
  • the negative electrode inner uncoated region 220c is disposed at the center of the electrode assembly 200 and the negative electrode inner uncoated region 220c is folded to face each other, in the spiral wounding.
  • the negative active material layer 223 is formed on the opposite side of the negative electrode inner uncoated region 220c, so the negative active material layer 223 comes in contact with the separator 230.
  • the negative active material layer 223 formed on the opposite side of the negative electrode inner uncoated region 220c faces the positive active material layer 213 with the separator 230 therebetween and is associated with charging and discharging.
  • FIG. 7 is an exploded perspective view showing an electrode assembly according to a third exemplary embodiment.
  • FIG. 8 is a cross-sectional view of the electrode assembly in FIG. 7 in a coupled and wound state.
  • an electrode assembly 300 comprises a positive electrode 310, a negative electrode 320, and a separator 330 disposed between the positive electrode 310 and the negative electrode 320.
  • the positive electrode 310 and the negative electrode 320 are spirally wound with the separator 330 therebetween, and then pressed flat.
  • the rechargeable battery according to the present exemplary embodiment has the same structure as that of the rechargeable battery according to the first exemplary embodiment, except for the structure of the electrode assembly 300, so the description of the same structure is not repeated.
  • a positive active material layer 313 is attached to both sides of a positive electrode current collector 312 formed of a thin plate metal foil, and the positive electrode current collector 312 is formed in a stripe shape that is longer in one direction than in another direction.
  • the positive electrode 310 comprises a positive electrode coating portion 310a that is a region coated with the positive active material layer 313, and a positive electrode side uncoated region 310b that is a region without the positive active material layer 313 coated.
  • the positive electrode side end uncoated region 310b is formed to continue along one side end of the positive electrode 310 in the longitudinal direction I of the positive electrode 310.
  • a negative active material layer 323 is formed on both sides of a negative electrode current collector 322 formed of a thin plate metal foil, and the negative electrode current collector 322 is formed in a stripe shape that is longer in one direction than in another direction.
  • the separator 330 is made of a porous material, insulates the positive electrode 310 from the negative electrode 320, and provides a passage through which ions can move.
  • the negative electrode 320 comprises a negative electrode coating portion 320a that is a region coated with a negative active material layer 323, and a negative electrode side end uncoated region 320b that is a region without the negative active material layer 323 coated.
  • the negative electrode side end uncoated region 320b is formed to continue along one side end of the negative electrode 320 in the longitudinal direction I of the negative electrode 320.
  • the negative electrode 320 further comprises a negative electrode outer uncoated region 320c formed at the rear end of the negative electrode 320, and the negative electrode outer uncoated region 320c is positioned at the outermost side of the electrode assembly 300.
  • the negative electrode outer uncoated region 320c continues in the width direction w of the negative electrode 320 from the rear end of the negative electrode 320 and is connected with the negative electrode side end uncoated region 320b.
  • the negative electrode outer uncoated region 320c is configured without the negative active material layer 323 formed on one side of the negative electrode current collector 322, and thus the negative electrode current collector 322 is exposed at the negative electrode outer uncoated region 320c.
  • the negative electrode outer uncoated region 320c is disposed at the outermost side of the electrode assembly 300 and exposed to the outside of the electrode assembly 300, when wound.
  • the negative electrode 320 comprises the negative electrode outer uncoated region 320c, i.e., as the negative electrode outer uncoated region 120d of the first exemplary embodiment, the negative electrode 320 does not comprise a portion equivalent to the negative electrode inner uncoated region 120c of the first exemplary embodiment.
  • the negative active material layer 323 is formed on the opposite side of the negative electrode outer uncoated region 320c, so the negative active material layer 323 comes in contact with the separator 330.
  • the negative active material layer 323 formed on the opposite side of the negative electrode outer uncoated region 320c faces the positive active material layer 313 with the separator 330 therebetween and is associated with charging and discharging.
  • FIG. 9 is an exploded perspective view showing an electrode assembly according to a fourth exemplary embodiment.
  • FIG. 10 is a cross-sectional view of the electrode assembly in FIG. 9 in a coupled and wound state.
  • An electrode assembly 400 comprises a positive electrode 410, a negative electrode 420, and a separator 430 disposed between the positive electrode 410 and the negative electrode 420.
  • the positive electrode 410 and the negative electrode 420 are spirally wound with the separator 430 therebetween, and then pressed flat.
  • the rechargeable battery according to the present exemplary embodiment has the same structure as that of the rechargeable battery according to the first exemplary embodiment, except for the structure of the electrode assembly 400, so the description of the same structure is not repeated.
  • a positive active material layer 413 is attached to both sides of a positive electrode current collector 412 formed of a thin plate metal foil and the positive electrode current collector 412 is formed in a stripe shape that is longer in one direction than in another direction.
  • the positive electrode 410 comprises a positive electrode coating portion 410a that is a region coated with the positive active material layer 413, and a positive electrode side end uncoated region 410b that is a region without the positive active material layer 413 coated.
  • the positive electrode side end uncoated region 410b is formed to continue along one side end of the positive electrode 410 in the longitudinal direction I of the positive electrode 410.
  • a negative active material layer 423 is formed on both sides of a negative electrode current collector 422 formed of a thin plate metal foil and the negative electrode current collector 422 is formed in a stripe shape that is longer in one direction than in another direction.
  • the separator 430 is made of a porous material, insulates the positive electrode 410 from the negative electrode 420, and provides a passage through which ions can move.
  • the negative electrode 420 comprises a negative electrode coating portion 420a that is a region coated with a negative active material layer 423, and a negative electrode side end uncoated region 420b that is a region without the negative active material layer 423 coated.
  • the negative electrode side end uncoated region 420b is formed to continue along one side end of the negative electrode 420 in the longitudinal direction I of the negative electrode 420.
  • the positive electrode 410 further comprises a positive electrode inner uncoated region 410c formed at the front end of the positive electrode 410 and a positive electrode outer uncoated region 410d formed at the rear end of the positive electrode 410.
  • the positive electrode inner uncoated region 410c is positioned at the innermost side of the electrode assembly 400, and the positive electrode outer uncoated region 410d is positioned at the outermost side of the electrode assembly 400.
  • the positive electrode inner uncoated region 410c continues in the width direction w of the positive electrode 410 from the front end of the positive electrode 410 and is connected with the positive electrode side end uncoated region 410b.
  • the positive electrode inner uncoated region 410c is configured without the positive active material layer 413 formed on one side of the positive current collector 412, and thus one side of the positive current collector 412 is exposed at the positive electrode inner uncoated region 410c.
  • the positive electrode outer uncoated region 410d continues in the width direction w of the positive electrode 410 from the rear end of the positive electrode 410 and is connected with the positive electrode side end uncoated region 410b.
  • the positive outer uncoated region 410d is configured without the positive active material layer 413 formed on one side of the positive current collector 412, and thus one side of the positive current collector 412 is exposed at the positive electrode outer uncoated region 410d.
  • the positive electrode 410 and the negative electrode 420 are spirally wound after disposing the separator 430, which is an insulator, therebetween, and then pressed flat.
  • the positive electrode inner uncoated region 410c is disposed at the center of the electrode assembly 400 and the positive electrode inner uncoated region 410c is folded to face each other, in the spiral wounding.
  • a positive active material layer 413 is formed on the opposite side of the positive electrode inner uncoated region 410c and comes in contact with the separator 430, and the positive active material layer 413 faces the negative active material layer 423 with the separator 430 therebetween and is associated with charging and discharging.
  • the positive electrode outer uncoated region 410d is disposed at the outermost side of the electrode assembly 400 and exposed to the outside of the electrode assembly 400.
  • the positive active material layer 413 is formed on the opposite side of the positive electrode outer uncoated region 410d, so the positive active material layer 413 comes in contact with the separator 430.
  • the positive active material layer 413 formed on the opposite side (inner side) of the positive electrode outer uncoated region 410d faces the negative active material layer 423 with the separator 430 therebetween and is associated with charging and discharging.
  • the positive electrode inner uncoated region 410c is formed where the positive electrodes 410 face each other at the innermost side of the electrode assembly 400, it is possible to reduce the volume and the weight of the electrode assembly 400 by removing unnecessary active material layer that is not associated with charging and discharging. Further, since the positive electrode outer uncoated region 410d is formed at a portion that does not face the negative electrode 420 at the outermost side of the electrode assembly 400, it is possible to reduce the volume and the weight of the electrode assembly 400.
  • the exemplary embodiments it is possible to improve energy density and prevent unnecessary waste of a raw material by forming an uncoated region at a portion that is not associated with charging and discharging.
  • conventional positive and negative electrodes have an active material layer that is not associated with charging and discharging because of the structural features of the conventional electrode assembly. Therefore, the active material layers in the conventional electrode assembly unnecessarily increase the weight and volume of the electrode assembly.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Connection Of Batteries Or Terminals (AREA)
EP13181665.4A 2012-11-23 2013-08-26 Elektrodenanordnung und wiederaufladbare batterie damit Active EP2736102B1 (de)

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KR1020120133993A KR101666873B1 (ko) 2012-11-23 2012-11-23 전극 어셈블리와 이를 갖는 이차전지

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KR102368089B1 (ko) * 2015-01-28 2022-02-24 삼성에스디아이 주식회사 전극탭을 갖는 전극 어셈블리 및 이차 전지
KR102368092B1 (ko) * 2015-01-28 2022-02-24 삼성에스디아이 주식회사 전극탭을 갖는 전극 어셈블리 및 이차 전지
KR102368090B1 (ko) * 2015-01-28 2022-02-24 삼성에스디아이 주식회사 전극탭을 갖는 전극 어셈블리 및 이차 전지
KR102316338B1 (ko) * 2017-04-14 2021-10-22 주식회사 엘지에너지솔루션 전극조립체
JP2019145262A (ja) * 2018-02-19 2019-08-29 トヨタ自動車株式会社 二次電池
KR20210019846A (ko) * 2019-08-13 2021-02-23 삼성에스디아이 주식회사 전극 조립체 및 이를 포함하는 이차전지
CN113300031A (zh) * 2021-05-21 2021-08-24 东莞塔菲尔新能源科技有限公司 一种动力电池及动力电池的焊接方法
CN114335425B (zh) * 2022-01-12 2023-07-25 三一技术装备有限公司 极片、隔膜、叠片、电芯、电芯制作工艺及电池

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WO2009011517A1 (en) * 2007-07-16 2009-01-22 Lg Chem, Ltd. Jelly-roll of structure having elastic member adhered on active material-non-coated portion and secondary battery employed with the same
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KR101666873B1 (ko) 2016-10-17
US9263761B2 (en) 2016-02-16
US20140147714A1 (en) 2014-05-29
KR20140066575A (ko) 2014-06-02
EP2736102B1 (de) 2019-06-26
CN103840096A (zh) 2014-06-04
CN103840096B (zh) 2017-11-17

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